十万个为什么·科学启蒙30篇（1）

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我们为什么会打嗝？

Hiccups happen when your diaphragm—the main breathing muscle—spasms suddenly.
Each spasm pulls air quickly into your throat, making your vocal cords snap shut.
That sharp closure creates the classic 'hic' sound we all recognize.
Common triggers include eating too fast, drinking carbonated drinks, or feeling nervous.
Sometimes hiccups follow sudden temperature changes or excitement in children.
Most hiccups last only a few minutes and stop without treatment.
Doctors think hiccups may help babies burp up air while feeding in the womb.
Long-lasting hiccups (over 48 hours) are rare but need medical check-ups.
Breathing into a paper bag or holding your breath can reset your breathing rhythm.
Scientists continue studying hiccup nerves to understand brain-body communication better.